TAS RNG issues

Hey I'm actually working on a TAS (tool assisted speedrun) on "Monster Tale" and decided to use Desmume as my emulator because this http://tasvideos.org/EmulatorResources.html said it was a "prefered" emulator (and because I already use it)

So as you saw in the title, I got some RNG (random number generation) issues, I know that Monster Tale's RNG is based on the DS clock, wich is, in desmume, windows' internal clock... Yup, so I can't manipulate randomness... And as you probably know if you're a speedrunner, TASing is impossible without manipulating RNG in most of the games.

I'd like to know if there is a way to give a fake seed to Desmume (example: when the game starts, ask for the time, and then he incements it by 1 every 60 frames)Or maybe you could help me to find a way manipulating windows' clock PRECISELY, that could fix my problem too